title: Unique water-water coordination tailored by a metal surface.
abstract: At low coverage of water on Cu(110), substrate-mediated electrostatics lead to zigzagging chains along [001] as observed with STM [T. Yamada, S. Tamamori, H. Okuyama, and T. Aruga, "Anisotropic water chain growth on Cu(110) observed with scanning tunneling microscopy" Phys. Rev. Lett. 96, 036105 (2006)]. Using x-ray absorption spectroscopy we find an anomalous low-energy resonance at ~533.1 eV which, based on density functional theory spectrum simulations, we assign to an unexpected configuration of water units whose uncoordinated O-H bonds directly face those of their neighbors; this interaction repeats over trough sites with enhanced electron density and is analogous to the case of a hydrated electron.
authors.affiliation: Stanford Synchrotron Radiation Lightsource, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA.
authors.forename: T
authors.initials: T
authors.lastname: Schiros
authors.forename: K J
authors.initials: KJ
authors.lastname: Andersson
authors.forename: J
authors.initials: J
authors.lastname: MacNaughton
authors.forename: J
authors.initials: J
authors.lastname: Gladh
authors.forename: A
authors.initials: A
authors.lastname: Matsuda
authors.forename: H
authors.initials: H
authors.lastname: Öström
authors.forename: O
authors.initials: O
authors.lastname: Takahashi
authors.forename: L G M
authors.initials: LG
authors.lastname: Pettersson
authors.forename: A
authors.initials: A
authors.lastname: Nilsson
authors.forename: H
authors.initials: H
authors.lastname: Ogasawara